Guilds of Ravnica

Chance for Glory | Instant | | Creatures you control gain indestructible. Take an extra turn after this one. At the beginning of that turn's end step, you lose the game. | Bram Sels

Justice Strike | Instant | | Target creature deals damage to itself equal to its power. | Clint Cearley

Integrity | Instant | | Target creature gets +2/+2 until end of turn. | Ben Maier

Response | Instant | | Response deals 5 damage to target attacking or blocking creature. | Daarken